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پرونده:Sturgeon electromagnet.png

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Sturgeon_electromagnet.png(۴۲۲ × ۶۰۰ پیکسل، اندازهٔ پرونده: ۳۲ کیلوبایت، نوع MIME پرونده: image/png)

خلاصه

توضیح
English: Drawing of the first electromagnet, invented in 1824 by British scientist William Sturgeon. This was his original drawing from his 1824 paper to the British Royal Society of Arts, Manufactures, and Commerce. It was made of 18 turns of bare copper wire (insulated wire had not been invented) on a U-shaped lacquered iron core about 1 ft (30 cm) long and 1/2 inch (13 mm) diameter. When the wires were connected to a single cell copper-zinc-acid battery, the electromagnet could support 9 pounds. The little cups contain mercury and were an early method of making an electrical contact between wires. The one on the left acts as a power switch. Alterations to image: converted from JPG to 32color PNG.
(Detailed information is from Sylvanus P. Thompson (1891) Lectures on the Electromagnet, W.J. Johnson Co., New York, p.17-19)
تاریخ
منبع Downloaded August 9, 2008 from Joseph Henry's contributions to the Electromagnet, Smithsonian Institution Archives, neg. no. 46,761-D, where it is credited to Sturgeon, W. (1824) 'Improved Electro Magnetic Apparatus', Trans. Royal Society of Arts, Manufactures, and Commerce, Vol.43, Plate 3, fig.13.
پدیدآور William Sturgeon
اجازه‌نامه
(استفادهٔ مجدد از این پرونده)
Public domain - Author died 1850

اجازه‌نامه

Public domain

این اثر در کشورهایی و مناطقی که مدت زمان حق تکثیر، عمر پدیدآورنده بعلاوه 70 سال یا کمتر بعد از مرگ او است، در مالکیت عمومی قرار دارد.


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کنونی‏۹ اوت ۲۰۰۸، ساعت ۲۰:۲۴تصویر بندانگشتی از نسخهٔ مورخ ‏۹ اوت ۲۰۰۸، ساعت ۲۰:۲۴۴۲۲ در ۶۰۰ (۳۲ کیلوبایت)Chetvorno{{Information |Description={{en|Drawing of first Wikipedia:electromagnet invented in 1824 by British scientist William Sturgeon. It was made of 18 turns of copper wire on an iron core. This is Sturgeon's original drawing from his paper to the Britis

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